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Author Topic: Radeon HD 7660D Onboard dramatic drop in MH/s  (Read 2552 times)
bigbeninlondon
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April 21, 2013, 09:22:25 PM
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So for some reason my onboard Radeon HD 7660D just dropped from over 80 MH/s down to 20.  I can't figure out why and I can't get it to go back up.  I just reinstalled the drivers, nothing.  Temp would sit at 65-70 C with spikes to 75 Csometimes, now 30-35 C even when mining.  I'm using GUIMiner v2012-12-03; mobo is Gigabyte GA-F2A55M-HD2 with AMD A10-5800K APU, 650W PSU, 16GB RAM on Win7 64.

What can I check?  What would cause me to lose 75% of my hashing power?
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bigbeninlondon
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April 22, 2013, 10:52:48 AM
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Anyone?  No thoughts?  I know 80 MH/s isn't much, but my whole configuration is putting out 1 GH/s so I'm not worried too much about the revenue.  I worry more that something happened to the mobo itself.  Dropping from 80 to 20 seems to point to something gone wrong.  I just don't know what else to check.
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April 22, 2013, 07:52:03 PM
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This post seems to suggest the AMD APUs get recognized as two separate bits of hardware, so they require two separate workers in GUIMiner:

https://bitcointalk.org/index.php?topic=26145.msg1816794#msg1816794

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April 23, 2013, 10:26:09 PM
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That's true; but the one that signifies the CPU portion only hashes around 1 MH/s so I don't use it.  The onboard card alone used to get me 80 MH/s, and then one day just dropped to 20 MH/s with no evidence as to why.

Edit to add:  I feel almost like something else is mining on my onboard and taking my hash power.  Is this possible?
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April 24, 2013, 11:41:16 PM
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So I discovered the solution.  For some reason when a monitor is not plugged in to the card it gets significantly less hash power.  Weird.
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